Chpter IV Mechanical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
151
Fig. 4-3-8 Checking the valve
Fig. 4-3-9 Measuring the outer diameter of
valve stem
micrometer. See Fig. 4-3-9.
(2) Replace the valve and valve guide in pairs if any
outer diameter of valve stem is below the limitation.
The outer diameters of valve stem
Valve
Standard
Intake valve
5.960~5.975 mm
Exhaust valve
5.945~5.960 mm
(3) Measure the inner diameter of valve guide with a
micrometer.
(4) Subtract the measured outer diameter value of valve
stem from the measured inner diameter value of valve
guide. Replace the valve and valve guide in pairs if any
result is above the limitation
The valve guide clearances
Valve
Standard
Intake valve
0.039~0.069 mm
Exhaust valve
0.064~0.096 mm
Fig. 4-3-10 Cleaning the valve
3. Valve
3.1 Cleaning the valve
(1) Scrape off the accumulated carbon at the valve end
with a gasket scraper. See Fig. 4-3-10.
(2) Clean the valve thoroughly with a steel wire brush.
Intake valve
Exhaust valve
